# Tungsten

> Purpose-built certification software for EASA Part 21J design offices. Structured document workflows, approvals, and audit trails — so your engineers can focus on engineering, not paperwork.

Canonical Origin: https://www.tungsten.aero/

## LLM Resources

- [Full Content](https://www.tungsten.aero/llms-full.txt): Complete page content in markdown format.
- [sitemap.xml](https://www.tungsten.aero/sitemap.xml): XML sitemap for search engines and crawlers.
- [robots.txt](https://www.tungsten.aero/robots.txt): Crawler rules and permissions.

## Pages

- [/](https://www.tungsten.aero/index.md)
- [/blog](https://www.tungsten.aero/blog.md)
- [/blog/authority-matrix-access-control-part-21j](https://www.tungsten.aero/blog/authority-matrix-access-control-part-21j.md)
- [/blog/certification-milestone-baselines-part-21j](https://www.tungsten.aero/blog/certification-milestone-baselines-part-21j.md)
- [/blog/change-classification-major-minor-part-21j](https://www.tungsten.aero/blog/change-classification-major-minor-part-21j.md)
- [/blog/choosing-document-control-software-part-21j](https://www.tungsten.aero/blog/choosing-document-control-software-part-21j.md)
- [/blog/designing-for-compliance-prevent-certification-delays-part-21j](https://www.tungsten.aero/blog/designing-for-compliance-prevent-certification-delays-part-21j.md)
- [/blog/easa-part-21j-audit-readiness-checklist](https://www.tungsten.aero/blog/easa-part-21j-audit-readiness-checklist.md)
- [/blog/easa-rejections-7-common-submission-errors](https://www.tungsten.aero/blog/easa-rejections-7-common-submission-errors.md)
- [/blog/email-approvals-vs-structured-approval-gates-part-21j](https://www.tungsten.aero/blog/email-approvals-vs-structured-approval-gates-part-21j.md)
- [/blog/part-21j-approval-cycle-time-playbook](https://www.tungsten.aero/blog/part-21j-approval-cycle-time-playbook.md)
- [/blog/q4-certification-rush-part-21j](https://www.tungsten.aero/blog/q4-certification-rush-part-21j.md)
- [/blog/requirement-evidence-traceability-part-21j](https://www.tungsten.aero/blog/requirement-evidence-traceability-part-21j.md)
- [/blog/spreadsheet-costs-part-21j-design-offices](https://www.tungsten.aero/blog/spreadsheet-costs-part-21j-design-offices.md)
- [/blog/supplier-design-data-compliance-part-21j](https://www.tungsten.aero/blog/supplier-design-data-compliance-part-21j.md)
- [/comparison](https://www.tungsten.aero/comparison.md)
- [/cookies](https://www.tungsten.aero/cookies.md)
- [/faq](https://www.tungsten.aero/faq.md)
- [/features](https://www.tungsten.aero/features.md)
- [/pricing](https://www.tungsten.aero/pricing.md)
- [/privacy](https://www.tungsten.aero/privacy.md)
- [/terms](https://www.tungsten.aero/terms.md)
- [/trust](https://www.tungsten.aero/trust.md)